Millstone-dressing machine



3 Sheets-'Sheet 1.

(No Model.)

D. GREELY.

` MILLSTONE DRESSING MACHINE., N0. 298,461. Patented May 13, 1884.

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3 Sheets-Sheet 2.

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D.' s'. GREELY. MILLSTONE DRESSING MACHINE.

Patented May' 13, 1884.

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D. S. GREELY. MILLSTONE DRESSING MACHINE.

No. www.v Patented May 1s, 1884.

DAVID S. G'REELY, OF FOSTERS CROSSING, OHIO.

MILLSTONE-DRESSING MACHINE.

SPECIFICATION forming part ofLetters Patent No. 298,461, dated May 13, 188%.

Application filed June 18, 1883.

.'50 @ZZ whom it may concern:

Be it known that I, DAvIDS. GREELY, of Fosters Crossing, Warren county, Ohio, have invented a new and useful Millstone-Dressing Machine, of which the following is a specilication.

The invention relates to that class of millstone-dressing machines in which a diamond point secured to a properly-guided holder is employed for cutting the face and furrow surfaces of the stone or burr.

My improvements comprise among their objects increase of speed, greater accuracy, and more ready and comprehensive adjustments to diverse kinds of work.

In the accompanying drawings, Figure l is a. perspective view of a millstone-dresser embodying my invention, the tilting frame being shown slightly tipped for furrow dressing. Figs. 2 and 3 are respectively a side and an end elevation of the machine in condition for face-dressing. Fig. 4t is a transverse section of the machine in condition for furrow-dressing. Fig. 5 is a transverse section in the plane ofthe sliding sills handle. Fig. 6 is a section in the plane of the perforated center plates fastening and adjusting screws. Figs.

7, 8, and 9 are respectively side and top views and transverse section of the cross-carriage with its contained diamonds. Fig. 10 represents one of the two similar adjustable parts of the tilting frame.

A represents a staff-bed or bed-plate, which is preferably a rectangular frame of cast-iron, of sufficient width of central opening to receive the millstone-spindle when so desired. Fastened by bolts B transversely to said bedplate, near its respective ends, are plates C, having shoulders c c', for support of the tilting frame D in the horizontal position required for use in facing, as shown in Figs. 2 and 3. Mortises c in plate C receive the tenoned center block or pivot-bearing, E, numerous holes, e, in which may (any two corresponding ones of themone on each block) receive the two adjustable pivot-pins F of the tilting frame aforesaid, in which precisely identical holes, d, are provided for that purpose. These pivots F have several important duties. For example, in all conditions of the frame D, whether level or tilted, they serve (No model.)

to hold the frame, and consequently the diamonds, positively down to work, so as to avoid jumping or slipping at the hard places, which occurs in most burrs, and which constitutes one of the most serious difficulties in ordinary machine-dressing. rlhe said bolts F also do duty as fulcrums about which the frame Dis tilted. Two headless screws, G, enable a slight depression of plate E from time to time, sufficient to compensate for wear of the bearingsurfaces of the shoulders c c. Slots a in the ends of the bed-plate A receive screw-bolts H, which, being adjusted to right or left and then fastened by nuts 7i, operate to limit the tip of 65 the tilting frame to correspond with the desired slope of the furrow-floor. The screwbolts II may terminate in cranks or eccentrics h, in order that by partial rotation of the bolts there may be afforded an additional means of nice adjustment of said rests or bolts H. Lugs a, that project laterally from the bed-plate A, have bolts I, which occupy slots j in weights J, that are retained in position relatively to the bed-plate by means of nuts i. Indentations j in said weights enable them to be brought into any desired proximity to the spindle, their form being such that such proximity may be attained in different positions of the machine. Two such weights may be used-one on each side of the bed-plate-and either may be used inthe inverted position when desirable. rIheir office is to hold the machine immovably to its assigned position upon the stone.

Posts or bolts K, which extend upward from bed-plate A, occupy slotsZ in a sliding sill, L, an inclined slot, l', in whose side receives the rounded head m of a pin, M, which extends laterally from the tilting frame D.

l" is aknob or handle, which, being screwed down so as to press upon the bed-plate A, serves to hold said sill to any adjustment upon the bed-plate. The same knob Z, being slightly unscrewed, is available as a handle to give either a forward or a retractile movement to said sill. Aforward shift of the said sill causes pin M to rise in slot Z', and by so doing to elevate the right-hand side of the tilting frame to any desired height up to level with its lefthand side. The same movement causes the bolts K, by entrance into the parts of slots Z IOO remote from the tilting frame, to shift the sliding sill under the ears d of said frame, so as to firmly support it in its level position. A backward shift of the said sill operates to reverse all of these actions and to permit the righthand side of the tilting frame to drop to a greater or less extent, dependent on the amount of such retraction of the sill. This amount may be gradually in creased as the furrow-floor becomes lowered by successive dressings in equal increments by means of a temper-screw, L', in a pivoted nut, L", the head L'" of said screw occupying for this purpose a yoke, L, upon the sli-ding sill L, or simply abutting against said yoke, as may be found most appropriate to the special work to be performed.

'The adjustable rest H and the pin M, occupying the oblique slot Z' in the sliding sill L, may be used very conveniently in association, thus: Vhen it is desired to operate successively on two diverse kinds of furrows on the same stone, the rest H may be set for one kind of furrow, and the screw L', being swung clear of the yoke L", may be screwed back to such an extent that when retraction of the sill L brings the outside of yoke Liv against the head L"' of bolt L the tilting frame D will be tipped aright for one class of furrows, and when the sill L has been drawn cognpletelyback the resting of the frame D on the bolt H brings said frame in proper positionl for the operation on a furrow of the other class.

The tilting frame D has a pair of ways or tracks, d', for support and guidance of the carriage N. The said ways are preferably fiat on top, and obliquely undercut, as shown, so as to support the carriage-sills a on their flat tops, and to be pressed on their obliquely-undereut surfaces by correspondingly-formed adjustable gibs O, whose slots o receive fastening-bolts o. The described angular form of the contact surfaces of ways and gibs, together with the adjustability of the latter, enables such nice adaptability of the sliding surfaces as to insure accuracy and'smoothness of cut.

P is a bar, which discharges the twofold functions of a sight or leveling bar, and of a stop or gage to the upward vibrations of the cross-carriage Q, to whose downward vibrations a projection, P', of the same bar does like service as a stop or gage, and consequently determines the depthof cut of the diamonds, of which said lcross-carriage is the holder. This bar P P is fastened to the carriage N by six screws, of which four screws, R, serve as adjusting-screws, by which the leveling-bar is accurately adjusted, and two screws, R', (which pass through slots p in the bar,) serve to fasten said bar to whatever adjustment it has been brought by said screws R. Bearings S, erected on the carriage N, receive the journals of a screw, T, which occupies a nut, V, that constitutes an integral part of my cross-carriage Q. WV are arms, which are pivoted'on necks t of said screw, and supported by a bar, w, secured to the nut V. A handle, X, at the end of the cross-carriage nearest the operator, enables the simultaneous thrust of both carriages, both forward and backward, upon the ways d' of the tilting frame D, and also enables the operator to elevate the near end of the cross-carriage, for the double purpose of' withdrawing the diamonds from contact for the back or non-effective stroke, and by the same movement feeding them sidewise preparatory to the next stroke.

The mechanism by which elevation and depression of the cross-carriage are made effective for feed consists as follows: The screwthreaded shaft T carries at one eiitremity a duplex ratchet-wheel, Y Y', whose periphery is armed with two distinct circles of teeth, of which those of one circle, Y, are directed to the right, and those of the other circle, Y', are directed to the left. Secured to carriage N by pivot 1 (that occupies one of two similar screw-threaded orifices, 1, on remote sides of said carriage) is a vibrating plate, 2, which has an arm, 3, with a series of' holes, 4, one of which receives the pin 5 of a rod, 6, whose other extremity has a series of holes, 7 through one of which a pin, 8, passes into one of a series of holes, 9, in` one or other member of the double carriage-arm W. A consequence of the al'iove-described construction is that any vibration up and down of the cross-carriage is accompanied by a like vibration of said plate 2. The extent of these vibrations relatively to that of said carriage Q will depend on which of the several holes aforesaid are occupied by the said pins. Slots 10 11 in said plate 2 receive each one a pivot, 12 13, of which each pivot carries two pawls-to wit, the pivot 12 carries pawls 14 and 15, and the pivot 13 carries pawls 16 and 17. Of' these pawls the pawls 14 and 16, constituting one pair, operate on the teeth of circle Y, and while so operating the pawls 15 17 of the other pair are ungeared from their ratchet, and vice versa.

The means employed by me for ungearing .one or other set of pawls at discretion consist in giving one pawl, 15 17, of each pair the form of a spring, which pawls, when left at liberty, are held by their own resilience out of Contact with the ratchet-teeth, (in which condition they permit the other pawls, 14 16, to come into mesh,) but which, when depressed by a cam, 18, pivoted in the pawl of the other pair on the same pivot,engage with their proper circle of ratchet-teeth, and by the same movement elevate the pawls of the other pair clear of their ratchet. Vibration of the crosscarriage Q operates to turn the screw T in one or the other direction, and consequently to feed to the right or to the left, according to which pair of pawlsis brought into action; hence the device is adaptable to operating on either a right or left feed at will. Each pawlpivot has a thumb-nut, 19, which, being momentarily slackened, permits the shift of the pivot nearer to or farther from the fulcrum of plate 2 for agreater or less throw of the pawls, and consequently for a eoarser or finer feed.

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Another way in which the device may be changed from coarse to fine feed-say from cracking7 to si1rfacing7-is by casting off for the time being either the upper or the lower pawl, so as to cause the plate 2 to produce but one pawl movement to each forward and backward vibration. This capacity for ready change to finer work is very convenient when it becomes necessary to lower a hard elevation (pinhead that has been marked by the red-staff.

It is manifest that the above-described feedmovementis positive, and not dependent on a trip or spring of any kind, and that it can be accomplished at any part of the stroke of the carriage N.

The device is easily changed from a right to a left dress by drawing the carriage N, with its attachments,entirely off of the ways d and reversing the screw T, with its attached ratch- Vets Y Y', and transferring` plate 2 and its accessories to the other side of the carriage.

The cross-carriage Q has two set-screws, 2O 21, of which screw 20, by striking the levelingbar I?, serves to limit the ascent of the crosscarriage, and of which screw 2l, by striking the lower portion,]?, of the leveling-bar, serves to limit the descent of said cross-carriage, and at the same time to determine the depth of cut. A portion, V, of the cross-carriage is secured by hinge 22 to the main portion Q, and is made capable of being shifted laterally with respect to said main portion by means of a right and left screw, 23. The shiftable portion V of the cross-carriage has two parallel oblique orifices, fv, for the holders proper, 24 25, of as many diamond points 26 27, which holders are secured in their said sockets by set-screws 28 29. The sockets 'v have such relative position that when the parts Q and V are brought as near as they can be to one another the diamond 26 follows in the wake or track of diamond 27, and being set somewhat lower, can be made to deepen the cut initiated by its predecessor. On the other hand, each diamond may be set to the same depth and the parts Q and V separated the distance apart of a half-feed,77 and each diamond be used to cut its own crack, so as to double the speed of work. Still another arrangement of the diamond-holder may consist in such separation of parts Q and V as to give the two diamonds alateral separation equal to the distance of a full feed77 with such set of the diamonds that one will follow and deepen the track made by the other on the preceding stroke. In the arrangement shown the handle X. and the gage screws 20 2l are located in the shiftable part V of the cross-carriage; but they may be located, if preferred, in the part Q.

The carriage N is prevented being accidentally drawn entirely off of the ways by spring stops or buttons 27-one at each end of the way which does not suffer depression. rIlhe elastic character of these stops prevents any jar of the machine in the act of arresting the motion of the carriage. Each stop, being pivoted, as at 28', can be turned out of the way when it is desired to remove the carriage out of the frame.

Io enable accurate adjustment of the work, I fasten to the frame, by the same bolts, F, which constitute the fulcrums of the tilting frame, ears 29', for attachment of a rubber thong, 30, which, being placed immediately over a mark upon the stone, insures the proper location and direction of cut. The thong 30, thus attached to the ear 29may, when desired, be brought around a pivoted hook or button, 31, upon the ear, in order to enable any rectification of alignment rendered necessary by the displacement of the thong laterally in theact of tilting the frame.

32 is a stop-screw, whose adjustment out or in serves to limit the excursions of the crosscarriage Q. rI`his stop on reversal of the feed-movement 'to the other side of the carriage N, is shifted to a corresponding screwthreaded aperture on the other side of said carriage N.

It will be seen that the particular shape of the weights J and their mode of attachment allow of their being placed on the machine in many different positions-for example, in such position as to concentrate the weight in theimmediate neighborhood of the work-and each weight being of similar form above and below and being reversible, and its ends being differently scalloped, allow it to be placed near the spindle withoutbeing obstructed by the same. u

To dress a burr higher at skirt than at eye, it is only necessary to unscrew the bolt B and place thin strips of any hard substance between plate C and the bed-plate A, and then drive the bolts home again, so as Lto elevate by that much the ends ofthe ways nearest the operator. The thong 30 enables the operator to get the machine exactly over the furrow by sighting down the thong to the edge of the furrow, and when the dia-mond strikes the thong the elastic character of the latter allows vit to yield laterally, so as not to interfere with the diamonds action.

The feed mechanism, being located upon and traveling with the carriage and under instant control by the operator, can be commenced and terminated at any part of the stroke without having to reach a given point on the bedplate to feed for new crack.

The sight or leveling-bar P P is utilized to gage or limit both upward and downward strokes of the cross-carriage, in addition to its proper tramming functions.

Important advantages accrue from the separate and independent adj ustability to the right or to the left of the two fulcrum-bolts F. For example, by putting the bolt at one end of the machine in the fifth hole and the bolt at the other end in the third hole, and then suffering the frame to tilt, afurrow deeper and correspondingly wider is produced at one end than at the other end; and in order to bring the frame down gradually as suces- IIO sive passes deepen the furrow, the operator 'has but to grasp the knob Z, and, after giving it a half-turn to the left, to pull the sill L endwise until the bolt M hasldropped the desired depth, then to tighten the knob and go through with his eut, repeating the movements at the next furrow, and .to continue the process at each successive circuit, where necessary, until the desired depth of each respective class of furrow has been attained.

I claim as new and of my invention- 1. In a millstone-dresser, the combination of a bed-frame having a series of horizontal perforations in its ends, a tilting frame having a corresponding series of horizontal perforations in its ends, one hole of each series of perforations being at the middle part of the end, and pivot-pins to support and hold down the tilting frame from the bed-frame, the pivot-pins being adjustable from or toward a central position, either in or cnt of line with each other, and forming the fulcrums on which the tilting frame can be tipped toward either side of the bed-frame.

2. In a millstone-dresser, the combination of a bed-frame having a series of horizontal/perforations, and slots beneath the perforations in its ends, a tilting frame having a corresponding series of horizontal perforations in its ends, pivot-pins to form adjustable fulcrums to securve the tilting frame to the bed-frame, and bolts adjustable in the slots to limit the tip of the tilting frame.

3. In a millstone-dresser, the combination of a rectangular frame, a tilting frame having a series of holes in its ends, plates secured on the ends of the rectangular frame, having shoulders for the carriage-frame, and 'mortises, center block having tenons to occupy the mortises, and a series of holes corresponding to the holes in the ends of the tilting frame, and

adjustable pivot-pins securing the frames together.

4. In a millstone-dresser, the combination of a bed-plate having posts K, a tilting frame, D, having pin M, and a sliding sill, L, having crooked slots Z to receive the posts, and slanting groove l to receive the pin, as set forth. p

5. In a millstone-dresser, the combination of abcd-plate, atilting frame pivoted to the ends of the bed-plate having ears, posts extending upward from the bed-plate, and a sliding sill having slots to receive the posts, and thus adapted to move sidewise beneath the ears of the tilting frame.

6. In a millstone-dresser, the combination of bed-plate A, having swinging nut L thereon, a tilting frame, D, and a sliding sill, L, provided with a yoke, Li", and adjustingscrew L', tapped Within the swinging nut and having its head engaged by said yoke, as set forth.

7. In a millstone-dresser, the cross-carriage Q, having a part, V, hinged to swing laterally, provided with diamond-holders arranged one in advance of the other, and a screw, 23, to adjust the hinged part to place the holders either in or out of line, as set forth.

8. In a millstone-dresser, the combination of main carriage N, cross-carriage Q, feed-screw T, by which the cross-carriage is hinged to the main carriage, the adjustable bar P P', to limit the upward and downward movement of the cross-carriage, and at the same time discharge the functions of a leveling-gage, and screws 20 21, to respectively limit the upward movement of and adjust the cross-carriage, as set forth.

9. In a millstone-dresser, the combination of main carriage N, adjustable screw T, mounted in bearings thereon, having necks t, cross-carriage Q, hinged to the screw, arms W, hinged to the necks, bar w, supported by the crosscarriage and supporting the upper ends of the arms, and set-screw adjustable through an arm to limit the excursions of the cross-carriage.

10. In a millstone-dresser, the positivelyacting feed mechanism, consisting of reverselydirected ratchets Y Y on the screw-shaft "Il, in combination with the vertically-rocking crosscarriage Q, arm XV, connected by rod 6 with vibrating plate 2, carrying the two sets of pawls 14 16 and 1517, and the reversing-cams 18, substantially as set forth.

11. In a millstone-dresser, the combination, with the frame and the carriages, of the stretched thong, fulcrum-ears 29, and hooks by which the thong is secured to the fulcrumears, as set forth.

12. In a millstone-dresser, the combination of a bed-plate, A, having horizontal lugs a, supporting-bolts I, and the weights J, adapted to slide longitudinally on the lugs, having slots j to receive the bolts, as set forth.

In testimony of which invention I hereunto set my hand.

DAVID s. GREELY.

Attest:

GEO. H. KNIGHT, SAML. S. CARPENTER.

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